Naruto: Kato Dan's Journey Against Fate

At the end of the Fourth Ninja World War, Kabuto Yakushi's large-scale reincarnation of filth caused a rift in the spiritual world. Drawn by the art of spiritualization and the turbulence of time and space, Duan's soul unexpectedly returned to the world of the dead. Before his own body was devoured by wild beasts, he used the method of seizing the body to possess the body of a ninja with all attributes of the Sharingan, and hid in the troubled times. Bearing in mind Jiraiya's advice to "not go against the great history, but to protect the regrets", Kato Dan hid in the valley on the border of Fire and Rain for five years, practiced medical treatment and all-attribute ninjutsu, integrated the future trajectory heard in the spirit world, and formulated a secret redemption plan. He stepped out of the secret realm and traveled through key nodes in the ninja world - rewriting Yahiko's fate under the dark clouds of the Land of Rain, protecting Lin Zhou in the smoke of the Kannabi Bridge, guarding Shisui on the eve of the Uchiha genocide, and reversing the death of Ningji on the battlefield of the Fourth Ninja War... This time, the endless regrets left by the person who failed to protect him will be rewritten one by one during his journey against fate.